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Compaction and Pressureless Sintering of Zirconia Nanoparticles
Author(s) -
Trunec Martin,
Maca Karel
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01781.x
Subject(s) - materials science , sintering , compaction , ceramic , cubic zirconia , microstructure , nanoparticle , grain size , relative density , green body , composite material , pressureless sintering , homogeneous , pressing , grain growth , nanometre , mineralogy , nanotechnology , chemistry , physics , thermodynamics
Four nanometer‐sized zirconia powders stabilized by 3 mol% Y 2 O 3 were used for the preparation of dense bulk ceramics. Ceramic green bodies were prepared by cold isostatic pressing at pressures of 300–1000 MPa. The size of the pores in ceramic green bodies and their evolution during sintering were correlated with the characteristics of individual nanopowders and with the sintering behavior of powder compacts. Only homogeneous green bodies with pores of <10 nm could be sintered into dense bodies (>99% t.d.) at a sufficiently low temperature to keep the grain sizes in the range <100 nm. Powders with uniform particles 10 nm in size yielded green bodies of required microstructure. These nanoparticle compacts were sintered without pressure to give bodies (diameter 20 mm, thickness 4 mm) with a relative density higher than 99% and a grain size of about 85 nm (as determined by the linear intercept method).